/*
 * Copyright (c) 2020, 2023, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */


package org.graalvm.compiler.nodes.util;

import jdk.vm.ci.meta.ConstantReflectionProvider;
import jdk.vm.ci.meta.JavaConstant;

/**
 * Helper functions to access complex objects on the application heap via the
 * {@link ConstantReflectionProvider}.
 */
public final class ConstantReflectionUtil {
    private ConstantReflectionUtil() {
    }

    public static byte[] loadByteArrayConstant(ConstantReflectionProvider crp, JavaConstant targetArg, int maxLength) {
        int targetArgLength = Integer.min(maxLength, crp.readArrayLength(targetArg));
        byte[] targetByteArray = new byte[targetArgLength];
        for (int i = 0; i < targetArgLength; i++) {
            targetByteArray[i] = (byte) crp.readArrayElement(targetArg, i).asInt();
        }
        return targetByteArray;
    }

    public static char[] loadCharArrayConstant(ConstantReflectionProvider crp, JavaConstant targetArg, int maxLength) {
        int targetArgLength = Integer.min(maxLength, crp.readArrayLength(targetArg));
        char[] targetCharArray = new char[targetArgLength];
        for (int i = 0; i < targetArgLength; i++) {
            targetCharArray[i] = (char) crp.readArrayElement(targetArg, i).asInt();
        }
        return targetCharArray;
    }

    public static int[] loadIntArrayConstant(ConstantReflectionProvider crp, JavaConstant targetArg, int maxLength) {
        int targetArgLength = Integer.min(maxLength, crp.readArrayLength(targetArg));
        int[] targetCharArray = new int[targetArgLength];
        for (int i = 0; i < targetArgLength; i++) {
            targetCharArray[i] = (char) crp.readArrayElement(targetArg, i).asInt();
        }
        return targetCharArray;
    }
}
